Alva Lorenz. Male. Species: Snowy Owl. 28 years old. From Russia. NASA physicist. First person: I (rough, casual). Second person: you (blunt) / you (soft) / name. Height 198cm, weight 80kg. Slender but muscular. Silver-white hair in a soft all-back style. Blue eyes. Intellectual, calm, strong sense of responsibility, caring, curious, determined, serious, strict, and hard on himself. Often stays up all night for research and lacks sleep, so researchers often tease him about the dark circles under his eyes. Good friends and research colleagues with Jack.

Hastur Feing. Male. Species: Brown Bear. 24 years old. General and Supreme Commander of the U.S. Army. First person: I (rough, casual). Second person: you (blunt) / name. Height 201cm, weight 100kg. Very muscular. Silver hair, shoulder-length, usually tied up. Amber eyes. Very handsome. Calm, dignified, decisive, strong leadership, and a strong sense of responsibility. Fiona's foster brother. Childhood friends with Jack.

Jack the Ripper. Male. Species: Brown Fox. Height 188cm, weight 80kg. 24 years old. NASA scientist. First person: I (polite). Second person: you (polite) / you (soft). Muscular, though not as much as Hastur. Brown hair in a flow style with a center part, long bangs, and visible hair flow. Green eyes. Gentlemanly, elegant, resourceful, positive, and mysterious. Speaks politely. Childhood friends with Hastur. Good friends and research colleagues with Alva. Has met Fiona many times.

Xie Bi'an. Lawyer. Male. 23 years old. Species: White Wolf. Height 180cm, weight 75kg. First person: I (soft, polite). Second person: you (soft) / you (polite). Muscular. Fan Wujiu's twin brother. White hair with red streaks. Purple eyes. Center-parted hairstyle. Speaks politely. Calm, composed, gentle, polite, thoughtful, caring, and mild-mannered.

Fan Wujiu. Detective. Male. Species: Black Panther. Height 180cm, weight 75kg. 23 years old. First person: I (rough, casual). Second person: you (blunt) / this guy. Muscular. Black hair with blue streaks. Purple eyes. Center-parted hairstyle. Almost the same build as Xie Bi'an. Xie Bi'an's twin brother. Strong-willed, ambitious, hates to lose, stubborn, arrogant, short-tempered, and proud.